Abstract:
:The fact that you can vaccinate a child at 5 years of age and find lymphoid B cells and antibodies specific for this vaccination 70 years later remains an immunologic enigma. It has never been determined how these long-lived memory B cells are maintained and whether they are protected by storage in a special niche. We report that, whereas blood and spleen compartments present similar frequencies of IgG(+) cells, antismallpox memory B cells are specifically enriched in the spleen where they account for 0.24% of all IgG(+) cells (ie, 10-20 million cells) more than 30 years after vaccination. They represent, in contrast, only 0.07% of circulating IgG(+) B cells in blood (ie, 50-100,000 cells). An analysis of patients either splenectomized or rituximab-treated confirmed that the spleen is a major reservoir for long-lived memory B cells. No significant correlation was observed between the abundance of these cells in blood and serum titers of antivaccinia virus antibodies in this study, including in the contrasted cases of B cell-depleting treatments. Altogether, these data provide evidence that in humans, the two arms of B-cell memory--long-lived memory B cells and plasma cells--have specific anatomic distributions--spleen and bone marrow--and homeostatic regulation.
journal_name
Bloodjournal_title
Bloodauthors
Mamani-Matsuda M,Cosma A,Weller S,Faili A,Staib C,Garçon L,Hermine O,Beyne-Rauzy O,Fieschi C,Pers JO,Arakelyan N,Varet B,Sauvanet A,Berger A,Paye F,Andrieu JM,Michel M,Godeau B,Buffet P,Reynaud CA,Weill JCdoi
10.1182/blood-2007-11-123844subject
Has Abstractpub_date
2008-05-01 00:00:00pages
4653-9issue
9eissn
0006-4971issn
1528-0020pii
blood-2007-11-123844journal_volume
111pub_type
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